/*
* Copyright 2002-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.hotswap.agent.util.spring.util;
import java.beans.Introspector;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
/**
* Miscellaneous class utility methods. Mainly for internal use within the
* framework.
*
* @author Juergen Hoeller
* @author Keith Donald
* @author Rob Harrop
* @author Sam Brannen
* @since 1.1
* @see TypeUtils
* @see ReflectionUtils
*/
public abstract class ClassUtils {
/** Suffix for array class names: "[]" */
public static final String ARRAY_SUFFIX = "[]";
/** Prefix for internal array class names: "[" */
private static final String INTERNAL_ARRAY_PREFIX = "[";
/** Prefix for internal non-primitive array class names: "[L" */
private static final String NON_PRIMITIVE_ARRAY_PREFIX = "[L";
/** The package separator character '.' */
private static final char PACKAGE_SEPARATOR = '.';
/** The path separator character '/' */
private static final char PATH_SEPARATOR = '/';
/** The inner class separator character '$' */
private static final char INNER_CLASS_SEPARATOR = '$';
/** The CGLIB class separator character "$$" */
public static final String CGLIB_CLASS_SEPARATOR = "$$";
/** The ".class" file suffix */
public static final String CLASS_FILE_SUFFIX = ".class";
/**
* Map with primitive wrapper type as key and corresponding primitive type
* as value, for example: Integer.class -> int.class.
*/
private static final Map<Class<?>, Class<?>> primitiveWrapperTypeMap = new IdentityHashMap<Class<?>, Class<?>>(8);
/**
* Map with primitive type as key and corresponding wrapper type as value,
* for example: int.class -> Integer.class.
*/
private static final Map<Class<?>, Class<?>> primitiveTypeToWrapperMap = new IdentityHashMap<Class<?>, Class<?>>(8);
/**
* Map with primitive type name as key and corresponding primitive type as
* value, for example: "int" -> "int.class".
*/
private static final Map<String, Class<?>> primitiveTypeNameMap = new HashMap<String, Class<?>>(32);
/**
* Map with common "java.lang" class name as key and corresponding Class as
* value. Primarily for efficient deserialization of remote invocations.
*/
private static final Map<String, Class<?>> commonClassCache = new HashMap<String, Class<?>>(32);
static {
primitiveWrapperTypeMap.put(Boolean.class, boolean.class);
primitiveWrapperTypeMap.put(Byte.class, byte.class);
primitiveWrapperTypeMap.put(Character.class, char.class);
primitiveWrapperTypeMap.put(Double.class, double.class);
primitiveWrapperTypeMap.put(Float.class, float.class);
primitiveWrapperTypeMap.put(Integer.class, int.class);
primitiveWrapperTypeMap.put(Long.class, long.class);
primitiveWrapperTypeMap.put(Short.class, short.class);
for (Map.Entry<Class<?>, Class<?>> entry : primitiveWrapperTypeMap.entrySet()) {
primitiveTypeToWrapperMap.put(entry.getValue(), entry.getKey());
registerCommonClasses(entry.getKey());
}
Set<Class<?>> primitiveTypes = new HashSet<Class<?>>(32);
primitiveTypes.addAll(primitiveWrapperTypeMap.values());
primitiveTypes.addAll(Arrays.asList(new Class<?>[] { boolean[].class, byte[].class, char[].class, double[].class, float[].class, int[].class, long[].class, short[].class }));
primitiveTypes.add(void.class);
for (Class<?> primitiveType : primitiveTypes) {
primitiveTypeNameMap.put(primitiveType.getName(), primitiveType);
}
registerCommonClasses(Boolean[].class, Byte[].class, Character[].class, Double[].class, Float[].class, Integer[].class, Long[].class, Short[].class);
registerCommonClasses(Number.class, Number[].class, String.class, String[].class, Object.class, Object[].class, Class.class, Class[].class);
registerCommonClasses(Throwable.class, Exception.class, RuntimeException.class, Error.class, StackTraceElement.class, StackTraceElement[].class);
}
/**
* Register the given common classes with the ClassUtils cache.
*/
private static void registerCommonClasses(Class<?>... commonClasses) {
for (Class<?> clazz : commonClasses) {
commonClassCache.put(clazz.getName(), clazz);
}
}
/**
* Return the default ClassLoader to use: typically the thread context
* ClassLoader, if available; the ClassLoader that loaded the ClassUtils
* class will be used as fallback.
* <p>
* Call this method if you intend to use the thread context ClassLoader in a
* scenario where you clearly prefer a non-null ClassLoader reference: for
* example, for class path resource loading (but not necessarily for
* {@code Class.forName}, which accepts a {@code null} ClassLoader reference
* as well).
*
* @return the default ClassLoader (only {@code null} if even the system
* ClassLoader isn't accessible)
* @see Thread#getContextClassLoader()
* @see ClassLoader#getSystemClassLoader()
*/
public static ClassLoader getDefaultClassLoader() {
ClassLoader cl = null;
try {
cl = Thread.currentThread().getContextClassLoader();
} catch (Throwable ex) {
// Cannot access thread context ClassLoader - falling back...
}
if (cl == null) {
// No thread context class loader -> use class loader of this class.
cl = ClassUtils.class.getClassLoader();
if (cl == null) {
// getClassLoader() returning null indicates the bootstrap
// ClassLoader
try {
cl = ClassLoader.getSystemClassLoader();
} catch (Throwable ex) {
// Cannot access system ClassLoader - oh well, maybe the
// caller can live with null...
}
}
}
return cl;
}
/**
* Override the thread context ClassLoader with the environment's bean
* ClassLoader if necessary, i.e. if the bean ClassLoader is not equivalent
* to the thread context ClassLoader already.
*
* @param classLoaderToUse
* the actual ClassLoader to use for the thread context
* @return the original thread context ClassLoader, or {@code null} if not
* overridden
*/
public static ClassLoader overrideThreadContextClassLoader(ClassLoader classLoaderToUse) {
Thread currentThread = Thread.currentThread();
ClassLoader threadContextClassLoader = currentThread.getContextClassLoader();
if (classLoaderToUse != null && !classLoaderToUse.equals(threadContextClassLoader)) {
currentThread.setContextClassLoader(classLoaderToUse);
return threadContextClassLoader;
} else {
return null;
}
}
/**
* Replacement for {@code Class.forName()} that also returns Class instances
* for primitives (e.g. "int") and array class names (e.g. "String[]").
* Furthermore, it is also capable of resolving inner class names in Java
* source style (e.g. "java.lang.Thread.State" instead of
* "java.lang.Thread$State").
*
* @param name
* the name of the Class
* @param classLoader
* the class loader to use (may be {@code null}, which indicates
* the default class loader)
* @return Class instance for the supplied name
* @throws ClassNotFoundException
* if the class was not found
* @throws LinkageError
* if the class file could not be loaded
* @see Class#forName(String, boolean, ClassLoader)
*/
public static Class<?> forName(String name, ClassLoader classLoader) throws ClassNotFoundException, LinkageError {
Assert.notNull(name, "Name must not be null");
Class<?> clazz = resolvePrimitiveClassName(name);
if (clazz == null) {
clazz = commonClassCache.get(name);
}
if (clazz != null) {
return clazz;
}
// "java.lang.String[]" style arrays
if (name.endsWith(ARRAY_SUFFIX)) {
String elementClassName = name.substring(0, name.length() - ARRAY_SUFFIX.length());
Class<?> elementClass = forName(elementClassName, classLoader);
return Array.newInstance(elementClass, 0).getClass();
}
// "[Ljava.lang.String;" style arrays
if (name.startsWith(NON_PRIMITIVE_ARRAY_PREFIX) && name.endsWith(";")) {
String elementName = name.substring(NON_PRIMITIVE_ARRAY_PREFIX.length(), name.length() - 1);
Class<?> elementClass = forName(elementName, classLoader);
return Array.newInstance(elementClass, 0).getClass();
}
// "[[I" or "[[Ljava.lang.String;" style arrays
if (name.startsWith(INTERNAL_ARRAY_PREFIX)) {
String elementName = name.substring(INTERNAL_ARRAY_PREFIX.length());
Class<?> elementClass = forName(elementName, classLoader);
return Array.newInstance(elementClass, 0).getClass();
}
ClassLoader clToUse = classLoader;
if (clToUse == null) {
clToUse = getDefaultClassLoader();
}
try {
return (clToUse != null ? clToUse.loadClass(name) : Class.forName(name));
} catch (ClassNotFoundException ex) {
int lastDotIndex = name.lastIndexOf(PACKAGE_SEPARATOR);
if (lastDotIndex != -1) {
String innerClassName = name.substring(0, lastDotIndex) + INNER_CLASS_SEPARATOR + name.substring(lastDotIndex + 1);
try {
return (clToUse != null ? clToUse.loadClass(innerClassName) : Class.forName(innerClassName));
} catch (ClassNotFoundException ex2) {
// Swallow - let original exception get through
}
}
throw ex;
}
}
/**
* Resolve the given class name into a Class instance. Supports primitives
* (like "int") and array class names (like "String[]").
* <p>
* This is effectively equivalent to the {@code forName} method with the
* same arguments, with the only difference being the exceptions thrown in
* case of class loading failure.
*
* @param className
* the name of the Class
* @param classLoader
* the class loader to use (may be {@code null}, which indicates
* the default class loader)
* @return Class instance for the supplied name
* @throws IllegalArgumentException
* if the class name was not resolvable (that is, the class
* could not be found or the class file could not be loaded)
* @see #forName(String, ClassLoader)
*/
public static Class<?> resolveClassName(String className, ClassLoader classLoader) throws IllegalArgumentException {
try {
return forName(className, classLoader);
} catch (ClassNotFoundException ex) {
throw new IllegalArgumentException("Cannot find class [" + className + "]", ex);
} catch (LinkageError ex) {
throw new IllegalArgumentException("Error loading class [" + className + "]: problem with class file or dependent class.", ex);
}
}
/**
* Resolve the given class name as primitive class, if appropriate,
* according to the JVM's naming rules for primitive classes.
* <p>
* Also supports the JVM's internal class names for primitive arrays. Does
* <i>not</i> support the "[]" suffix notation for primitive arrays; this is
* only supported by {@link #forName(String, ClassLoader)}.
*
* @param name
* the name of the potentially primitive class
* @return the primitive class, or {@code null} if the name does not denote
* a primitive class or primitive array class
*/
public static Class<?> resolvePrimitiveClassName(String name) {
Class<?> result = null;
// Most class names will be quite long, considering that they
// SHOULD sit in a package, so a length check is worthwhile.
if (name != null && name.length() <= 8) {
// Could be a primitive - likely.
result = primitiveTypeNameMap.get(name);
}
return result;
}
/**
* Determine whether the {@link Class} identified by the supplied name is
* present and can be loaded. Will return {@code false} if either the class
* or one of its dependencies is not present or cannot be loaded.
*
* @param className
* the name of the class to check
* @param classLoader
* the class loader to use (may be {@code null}, which indicates
* the default class loader)
* @return whether the specified class is present
*/
public static boolean isPresent(String className, ClassLoader classLoader) {
try {
forName(className, classLoader);
return true;
} catch (Throwable ex) {
// Class or one of its dependencies is not present...
return false;
}
}
/**
* Return the user-defined class for the given instance: usually simply the
* class of the given instance, but the original class in case of a
* CGLIB-generated subclass.
*
* @param instance
* the instance to check
* @return the user-defined class
*/
public static Class<?> getUserClass(Object instance) {
Assert.notNull(instance, "Instance must not be null");
return getUserClass(instance.getClass());
}
/**
* Return the user-defined class for the given class: usually simply the
* given class, but the original class in case of a CGLIB-generated
* subclass.
*
* @param clazz
* the class to check
* @return the user-defined class
*/
public static Class<?> getUserClass(Class<?> clazz) {
if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
Class<?> superclass = clazz.getSuperclass();
if (superclass != null && Object.class != superclass) {
return superclass;
}
}
return clazz;
}
/**
* Check whether the given class is cache-safe in the given context, i.e.
* whether it is loaded by the given ClassLoader or a parent of it.
*
* @param clazz
* the class to analyze
* @param classLoader
* the ClassLoader to potentially cache metadata in
*/
public static boolean isCacheSafe(Class<?> clazz, ClassLoader classLoader) {
Assert.notNull(clazz, "Class must not be null");
try {
ClassLoader target = clazz.getClassLoader();
if (target == null) {
return true;
}
ClassLoader cur = classLoader;
if (cur == target) {
return true;
}
while (cur != null) {
cur = cur.getParent();
if (cur == target) {
return true;
}
}
return false;
} catch (SecurityException ex) {
// Probably from the system ClassLoader - let's consider it safe.
return true;
}
}
/**
* Get the class name without the qualified package name.
*
* @param className
* the className to get the short name for
* @return the class name of the class without the package name
* @throws IllegalArgumentException
* if the className is empty
*/
public static String getShortName(String className) {
Assert.hasLength(className, "Class name must not be empty");
int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR);
int nameEndIndex = className.indexOf(CGLIB_CLASS_SEPARATOR);
if (nameEndIndex == -1) {
nameEndIndex = className.length();
}
String shortName = className.substring(lastDotIndex + 1, nameEndIndex);
shortName = shortName.replace(INNER_CLASS_SEPARATOR, PACKAGE_SEPARATOR);
return shortName;
}
/**
* Get the class name without the qualified package name.
*
* @param clazz
* the class to get the short name for
* @return the class name of the class without the package name
*/
public static String getShortName(Class<?> clazz) {
return getShortName(getQualifiedName(clazz));
}
/**
* Return the short string name of a Java class in uncapitalized JavaBeans
* property format. Strips the outer class name in case of an inner class.
*
* @param clazz
* the class
* @return the short name rendered in a standard JavaBeans property format
* @see java.beans.Introspector#decapitalize(String)
*/
public static String getShortNameAsProperty(Class<?> clazz) {
String shortName = ClassUtils.getShortName(clazz);
int dotIndex = shortName.lastIndexOf(PACKAGE_SEPARATOR);
shortName = (dotIndex != -1 ? shortName.substring(dotIndex + 1) : shortName);
return Introspector.decapitalize(shortName);
}
/**
* Determine the name of the class file, relative to the containing package:
* e.g. "String.class"
*
* @param clazz
* the class
* @return the file name of the ".class" file
*/
public static String getClassFileName(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");
String className = clazz.getName();
int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR);
return className.substring(lastDotIndex + 1) + CLASS_FILE_SUFFIX;
}
/**
* Determine the name of the package of the given class, e.g. "java.lang"
* for the {@code java.lang.String} class.
*
* @param clazz
* the class
* @return the package name, or the empty String if the class is defined in
* the default package
*/
public static String getPackageName(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");
return getPackageName(clazz.getName());
}
/**
* Determine the name of the package of the given fully-qualified class
* name, e.g. "java.lang" for the {@code java.lang.String} class name.
*
* @param fqClassName
* the fully-qualified class name
* @return the package name, or the empty String if the class is defined in
* the default package
*/
public static String getPackageName(String fqClassName) {
Assert.notNull(fqClassName, "Class name must not be null");
int lastDotIndex = fqClassName.lastIndexOf(PACKAGE_SEPARATOR);
return (lastDotIndex != -1 ? fqClassName.substring(0, lastDotIndex) : "");
}
/**
* Return the qualified name of the given class: usually simply the class
* name, but component type class name + "[]" for arrays.
*
* @param clazz
* the class
* @return the qualified name of the class
*/
public static String getQualifiedName(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");
if (clazz.isArray()) {
return getQualifiedNameForArray(clazz);
} else {
return clazz.getName();
}
}
/**
* Build a nice qualified name for an array: component type class name +
* "[]".
*
* @param clazz
* the array class
* @return a qualified name for the array class
*/
private static String getQualifiedNameForArray(Class<?> clazz) {
StringBuilder result = new StringBuilder();
while (clazz.isArray()) {
clazz = clazz.getComponentType();
result.append(ClassUtils.ARRAY_SUFFIX);
}
result.insert(0, clazz.getName());
return result.toString();
}
/**
* Return the qualified name of the given method, consisting of fully
* qualified interface/class name + "." + method name.
*
* @param method
* the method
* @return the qualified name of the method
*/
public static String getQualifiedMethodName(Method method) {
Assert.notNull(method, "Method must not be null");
return method.getDeclaringClass().getName() + "." + method.getName();
}
/**
* Return a descriptive name for the given object's type: usually simply the
* class name, but component type class name + "[]" for arrays, and an
* appended list of implemented interfaces for JDK proxies.
*
* @param value
* the value to introspect
* @return the qualified name of the class
*/
public static String getDescriptiveType(Object value) {
if (value == null) {
return null;
}
Class<?> clazz = value.getClass();
if (Proxy.isProxyClass(clazz)) {
StringBuilder result = new StringBuilder(clazz.getName());
result.append(" implementing ");
Class<?>[] ifcs = clazz.getInterfaces();
for (int i = 0; i < ifcs.length; i++) {
result.append(ifcs[i].getName());
if (i < ifcs.length - 1) {
result.append(',');
}
}
return result.toString();
} else if (clazz.isArray()) {
return getQualifiedNameForArray(clazz);
} else {
return clazz.getName();
}
}
/**
* Check whether the given class matches the user-specified type name.
*
* @param clazz
* the class to check
* @param typeName
* the type name to match
*/
public static boolean matchesTypeName(Class<?> clazz, String typeName) {
return (typeName != null && (typeName.equals(clazz.getName()) || typeName.equals(clazz.getSimpleName()) || (clazz.isArray() && typeName.equals(getQualifiedNameForArray(clazz)))));
}
/**
* Determine whether the given class has a public constructor with the given
* signature.
* <p>
* Essentially translates {@code NoSuchMethodException} to "false".
*
* @param clazz
* the clazz to analyze
* @param paramTypes
* the parameter types of the method
* @return whether the class has a corresponding constructor
* @see Class#getMethod
*/
public static boolean hasConstructor(Class<?> clazz, Class<?>... paramTypes) {
return (getConstructorIfAvailable(clazz, paramTypes) != null);
}
/**
* Determine whether the given class has a public constructor with the given
* signature, and return it if available (else return {@code null}).
* <p>
* Essentially translates {@code NoSuchMethodException} to {@code null}.
*
* @param clazz
* the clazz to analyze
* @param paramTypes
* the parameter types of the method
* @return the constructor, or {@code null} if not found
* @see Class#getConstructor
*/
public static <T> Constructor<T> getConstructorIfAvailable(Class<T> clazz, Class<?>... paramTypes) {
Assert.notNull(clazz, "Class must not be null");
try {
return clazz.getConstructor(paramTypes);
} catch (NoSuchMethodException ex) {
return null;
}
}
/**
* Determine whether the given class has a public method with the given
* signature.
* <p>
* Essentially translates {@code NoSuchMethodException} to "false".
*
* @param clazz
* the clazz to analyze
* @param methodName
* the name of the method
* @param paramTypes
* the parameter types of the method
* @return whether the class has a corresponding method
* @see Class#getMethod
*/
public static boolean hasMethod(Class<?> clazz, String methodName, Class<?>... paramTypes) {
return (getMethodIfAvailable(clazz, methodName, paramTypes) != null);
}
/**
* Determine whether the given class has a public method with the given
* signature, and return it if available (else throws an
* {@code IllegalStateException}).
* <p>
* In case of any signature specified, only returns the method if there is a
* unique candidate, i.e. a single public method with the specified name.
* <p>
* Essentially translates {@code NoSuchMethodException} to
* {@code IllegalStateException}.
*
* @param clazz
* the clazz to analyze
* @param methodName
* the name of the method
* @param paramTypes
* the parameter types of the method (may be {@code null} to
* indicate any signature)
* @return the method (never {@code null})
* @throws IllegalStateException
* if the method has not been found
* @see Class#getMethod
*/
public static Method getMethod(Class<?> clazz, String methodName, Class<?>... paramTypes) {
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
if (paramTypes != null) {
try {
return clazz.getMethod(methodName, paramTypes);
} catch (NoSuchMethodException ex) {
throw new IllegalStateException("Expected method not found: " + ex);
}
} else {
Set<Method> candidates = new HashSet<Method>(1);
Method[] methods = clazz.getMethods();
for (Method method : methods) {
if (methodName.equals(method.getName())) {
candidates.add(method);
}
}
if (candidates.size() == 1) {
return candidates.iterator().next();
} else if (candidates.isEmpty()) {
throw new IllegalStateException("Expected method not found: " + clazz + "." + methodName);
} else {
throw new IllegalStateException("No unique method found: " + clazz + "." + methodName);
}
}
}
/**
* Determine whether the given class has a public method with the given
* signature, and return it if available (else return {@code null}).
* <p>
* In case of any signature specified, only returns the method if there is a
* unique candidate, i.e. a single public method with the specified name.
* <p>
* Essentially translates {@code NoSuchMethodException} to {@code null}.
*
* @param clazz
* the clazz to analyze
* @param methodName
* the name of the method
* @param paramTypes
* the parameter types of the method (may be {@code null} to
* indicate any signature)
* @return the method, or {@code null} if not found
* @see Class#getMethod
*/
public static Method getMethodIfAvailable(Class<?> clazz, String methodName, Class<?>... paramTypes) {
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
if (paramTypes != null) {
try {
return clazz.getMethod(methodName, paramTypes);
} catch (NoSuchMethodException ex) {
return null;
}
} else {
Set<Method> candidates = new HashSet<Method>(1);
Method[] methods = clazz.getMethods();
for (Method method : methods) {
if (methodName.equals(method.getName())) {
candidates.add(method);
}
}
if (candidates.size() == 1) {
return candidates.iterator().next();
}
return null;
}
}
/**
* Return the number of methods with a given name (with any argument types),
* for the given class and/or its superclasses. Includes non-public methods.
*
* @param clazz
* the clazz to check
* @param methodName
* the name of the method
* @return the number of methods with the given name
*/
public static int getMethodCountForName(Class<?> clazz, String methodName) {
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
int count = 0;
Method[] declaredMethods = clazz.getDeclaredMethods();
for (Method method : declaredMethods) {
if (methodName.equals(method.getName())) {
count++;
}
}
Class<?>[] ifcs = clazz.getInterfaces();
for (Class<?> ifc : ifcs) {
count += getMethodCountForName(ifc, methodName);
}
if (clazz.getSuperclass() != null) {
count += getMethodCountForName(clazz.getSuperclass(), methodName);
}
return count;
}
/**
* Does the given class or one of its superclasses at least have one or more
* methods with the supplied name (with any argument types)? Includes
* non-public methods.
*
* @param clazz
* the clazz to check
* @param methodName
* the name of the method
* @return whether there is at least one method with the given name
*/
public static boolean hasAtLeastOneMethodWithName(Class<?> clazz, String methodName) {
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
Method[] declaredMethods = clazz.getDeclaredMethods();
for (Method method : declaredMethods) {
if (method.getName().equals(methodName)) {
return true;
}
}
Class<?>[] ifcs = clazz.getInterfaces();
for (Class<?> ifc : ifcs) {
if (hasAtLeastOneMethodWithName(ifc, methodName)) {
return true;
}
}
return (clazz.getSuperclass() != null && hasAtLeastOneMethodWithName(clazz.getSuperclass(), methodName));
}
/**
* Given a method, which may come from an interface, and a target class used
* in the current reflective invocation, find the corresponding target
* method if there is one. E.g. the method may be {@code IFoo.bar()} and the
* target class may be {@code DefaultFoo}. In this case, the method may be
* {@code DefaultFoo.bar()}. This enables attributes on that method to be
* found.
* <p>
* <b>NOTE:</b> In contrast to
* {@link org.springframework.aop.support.AopUtils#getMostSpecificMethod},
* this method does <i>not</i> resolve Java 5 bridge methods automatically.
* Call
* {@link org.springframework.core.BridgeMethodResolver#findBridgedMethod}
* if bridge method resolution is desirable (e.g. for obtaining metadata
* from the original method definition).
* <p>
* <b>NOTE:</b> Since Spring 3.1.1, if Java security settings disallow
* reflective access (e.g. calls to {@code Class#getDeclaredMethods} etc,
* this implementation will fall back to returning the originally provided
* method.
*
* @param method
* the method to be invoked, which may come from an interface
* @param targetClass
* the target class for the current invocation. May be
* {@code null} or may not even implement the method.
* @return the specific target method, or the original method if the
* {@code targetClass} doesn't implement it or is {@code null}
*/
public static Method getMostSpecificMethod(Method method, Class<?> targetClass) {
if (method != null && isOverridable(method, targetClass) && targetClass != null && !targetClass.equals(method.getDeclaringClass())) {
try {
if (Modifier.isPublic(method.getModifiers())) {
try {
return targetClass.getMethod(method.getName(), method.getParameterTypes());
} catch (NoSuchMethodException ex) {
return method;
}
} else {
Method specificMethod = ReflectionUtils.findMethod(targetClass, method.getName(), method.getParameterTypes());
return (specificMethod != null ? specificMethod : method);
}
} catch (SecurityException ex) {
// Security settings are disallowing reflective access; fall
// back to 'method' below.
}
}
return method;
}
/**
* Determine whether the given method is declared by the user or at least
* pointing to a user-declared method.
* <p>
* Checks {@link Method#isSynthetic()} (for implementation methods) as well
* as the {@code GroovyObject} interface (for interface methods; on an
* implementation class, implementations of the {@code GroovyObject} methods
* will be marked as synthetic anyway). Note that, despite being synthetic,
* bridge methods ({@link Method#isBridge()}) are considered as user-level
* methods since they are eventually pointing to a user-declared generic
* method.
*
* @param method
* the method to check
* @return {@code true} if the method can be considered as user-declared;
* [@code false} otherwise
*/
public static boolean isUserLevelMethod(Method method) {
Assert.notNull(method, "Method must not be null");
return (method.isBridge() || (!method.isSynthetic() && !isGroovyObjectMethod(method)));
}
private static boolean isGroovyObjectMethod(Method method) {
return method.getDeclaringClass().getName().equals("groovy.lang.GroovyObject");
}
/**
* Determine whether the given method is overridable in the given target
* class.
*
* @param method
* the method to check
* @param targetClass
* the target class to check against
*/
private static boolean isOverridable(Method method, Class<?> targetClass) {
if (Modifier.isPrivate(method.getModifiers())) {
return false;
}
if (Modifier.isPublic(method.getModifiers()) || Modifier.isProtected(method.getModifiers())) {
return true;
}
return getPackageName(method.getDeclaringClass()).equals(getPackageName(targetClass));
}
/**
* Return a public static method of a class.
*
* @param clazz
* the class which defines the method
* @param methodName
* the static method name
* @param args
* the parameter types to the method
* @return the static method, or {@code null} if no static method was found
* @throws IllegalArgumentException
* if the method name is blank or the clazz is null
*/
public static Method getStaticMethod(Class<?> clazz, String methodName, Class<?>... args) {
Assert.notNull(clazz, "Class must not be null");
Assert.notNull(methodName, "Method name must not be null");
try {
Method method = clazz.getMethod(methodName, args);
return Modifier.isStatic(method.getModifiers()) ? method : null;
} catch (NoSuchMethodException ex) {
return null;
}
}
/**
* Check if the given class represents a primitive wrapper, i.e. Boolean,
* Byte, Character, Short, Integer, Long, Float, or Double.
*
* @param clazz
* the class to check
* @return whether the given class is a primitive wrapper class
*/
public static boolean isPrimitiveWrapper(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");
return primitiveWrapperTypeMap.containsKey(clazz);
}
/**
* Check if the given class represents a primitive (i.e. boolean, byte,
* char, short, int, long, float, or double) or a primitive wrapper (i.e.
* Boolean, Byte, Character, Short, Integer, Long, Float, or Double).
*
* @param clazz
* the class to check
* @return whether the given class is a primitive or primitive wrapper class
*/
public static boolean isPrimitiveOrWrapper(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");
return (clazz.isPrimitive() || isPrimitiveWrapper(clazz));
}
/**
* Check if the given class represents an array of primitives, i.e. boolean,
* byte, char, short, int, long, float, or double.
*
* @param clazz
* the class to check
* @return whether the given class is a primitive array class
*/
public static boolean isPrimitiveArray(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");
return (clazz.isArray() && clazz.getComponentType().isPrimitive());
}
/**
* Check if the given class represents an array of primitive wrappers, i.e.
* Boolean, Byte, Character, Short, Integer, Long, Float, or Double.
*
* @param clazz
* the class to check
* @return whether the given class is a primitive wrapper array class
*/
public static boolean isPrimitiveWrapperArray(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");
return (clazz.isArray() && isPrimitiveWrapper(clazz.getComponentType()));
}
/**
* Resolve the given class if it is a primitive class, returning the
* corresponding primitive wrapper type instead.
*
* @param clazz
* the class to check
* @return the original class, or a primitive wrapper for the original
* primitive type
*/
public static Class<?> resolvePrimitiveIfNecessary(Class<?> clazz) {
Assert.notNull(clazz, "Class must not be null");
return (clazz.isPrimitive() && clazz != void.class ? primitiveTypeToWrapperMap.get(clazz) : clazz);
}
/**
* Check if the right-hand side type may be assigned to the left-hand side
* type, assuming setting by reflection. Considers primitive wrapper classes
* as assignable to the corresponding primitive types.
*
* @param lhsType
* the target type
* @param rhsType
* the value type that should be assigned to the target type
* @return if the target type is assignable from the value type
* @see TypeUtils#isAssignable
*/
public static boolean isAssignable(Class<?> lhsType, Class<?> rhsType) {
Assert.notNull(lhsType, "Left-hand side type must not be null");
Assert.notNull(rhsType, "Right-hand side type must not be null");
if (lhsType.isAssignableFrom(rhsType)) {
return true;
}
if (lhsType.isPrimitive()) {
Class<?> resolvedPrimitive = primitiveWrapperTypeMap.get(rhsType);
if (resolvedPrimitive != null && lhsType.equals(resolvedPrimitive)) {
return true;
}
} else {
Class<?> resolvedWrapper = primitiveTypeToWrapperMap.get(rhsType);
if (resolvedWrapper != null && lhsType.isAssignableFrom(resolvedWrapper)) {
return true;
}
}
return false;
}
/**
* Determine if the given type is assignable from the given value, assuming
* setting by reflection. Considers primitive wrapper classes as assignable
* to the corresponding primitive types.
*
* @param type
* the target type
* @param value
* the value that should be assigned to the type
* @return if the type is assignable from the value
*/
public static boolean isAssignableValue(Class<?> type, Object value) {
Assert.notNull(type, "Type must not be null");
return (value != null ? isAssignable(type, value.getClass()) : !type.isPrimitive());
}
/**
* Convert a "/"-based resource path to a "."-based fully qualified class
* name.
*
* @param resourcePath
* the resource path pointing to a class
* @return the corresponding fully qualified class name
*/
public static String convertResourcePathToClassName(String resourcePath) {
Assert.notNull(resourcePath, "Resource path must not be null");
return resourcePath.replace(PATH_SEPARATOR, PACKAGE_SEPARATOR);
}
/**
* Convert a "."-based fully qualified class name to a "/"-based resource
* path.
*
* @param className
* the fully qualified class name
* @return the corresponding resource path, pointing to the class
*/
public static String convertClassNameToResourcePath(String className) {
Assert.notNull(className, "Class name must not be null");
return className.replace(PACKAGE_SEPARATOR, PATH_SEPARATOR);
}
/**
* Return a path suitable for use with {@code ClassLoader.getResource} (also
* suitable for use with {@code Class.getResource} by prepending a slash
* ('/') to the return value). Built by taking the package of the specified
* class file, converting all dots ('.') to slashes ('/'), adding a trailing
* slash if necessary, and concatenating the specified resource name to
* this. <br/>
* As such, this function may be used to build a path suitable for loading a
* resource file that is in the same package as a class file, although
* {@link org.hotswap.agent.util.spring.io.resource.springframework.core.io.ClassPathResource}
* is usually even more convenient.
*
* @param clazz
* the Class whose package will be used as the base
* @param resourceName
* the resource name to append. A leading slash is optional.
* @return the built-up resource path
* @see ClassLoader#getResource
* @see Class#getResource
*/
public static String addResourcePathToPackagePath(Class<?> clazz, String resourceName) {
Assert.notNull(resourceName, "Resource name must not be null");
if (!resourceName.startsWith("/")) {
return classPackageAsResourcePath(clazz) + "/" + resourceName;
}
return classPackageAsResourcePath(clazz) + resourceName;
}
/**
* Given an input class object, return a string which consists of the
* class's package name as a pathname, i.e., all dots ('.') are replaced by
* slashes ('/'). Neither a leading nor trailing slash is added. The result
* could be concatenated with a slash and the name of a resource and fed
* directly to {@code ClassLoader.getResource()}. For it to be fed to
* {@code Class.getResource} instead, a leading slash would also have to be
* prepended to the returned value.
*
* @param clazz
* the input class. A {@code null} value or the default (empty)
* package will result in an empty string ("") being returned.
* @return a path which represents the package name
* @see ClassLoader#getResource
* @see Class#getResource
*/
public static String classPackageAsResourcePath(Class<?> clazz) {
if (clazz == null) {
return "";
}
String className = clazz.getName();
int packageEndIndex = className.lastIndexOf(PACKAGE_SEPARATOR);
if (packageEndIndex == -1) {
return "";
}
String packageName = className.substring(0, packageEndIndex);
return packageName.replace(PACKAGE_SEPARATOR, PATH_SEPARATOR);
}
/**
* Build a String that consists of the names of the classes/interfaces in
* the given array.
* <p>
* Basically like {@code AbstractCollection.toString()}, but stripping the
* "class "/"interface " prefix before every class name.
*
* @param classes
* a Collection of Class objects (may be {@code null})
* @return a String of form "[com.foo.Bar, com.foo.Baz]"
* @see java.util.AbstractCollection#toString()
*/
public static String classNamesToString(Class<?>... classes) {
return classNamesToString(Arrays.asList(classes));
}
/**
* Build a String that consists of the names of the classes/interfaces in
* the given collection.
* <p>
* Basically like {@code AbstractCollection.toString()}, but stripping the
* "class "/"interface " prefix before every class name.
*
* @param classes
* a Collection of Class objects (may be {@code null})
* @return a String of form "[com.foo.Bar, com.foo.Baz]"
* @see java.util.AbstractCollection#toString()
*/
public static String classNamesToString(Collection<Class<?>> classes) {
if (CollectionUtils.isEmpty(classes)) {
return "[]";
}
StringBuilder sb = new StringBuilder("[");
for (Iterator<Class<?>> it = classes.iterator(); it.hasNext();) {
Class<?> clazz = it.next();
sb.append(clazz.getName());
if (it.hasNext()) {
sb.append(", ");
}
}
sb.append("]");
return sb.toString();
}
/**
* Copy the given Collection into a Class array. The Collection must contain
* Class elements only.
*
* @param collection
* the Collection to copy
* @return the Class array ({@code null} if the passed-in Collection was
* {@code null})
*/
public static Class<?>[] toClassArray(Collection<Class<?>> collection) {
if (collection == null) {
return null;
}
return collection.toArray(new Class<?>[collection.size()]);
}
/**
* Return all interfaces that the given instance implements as array,
* including ones implemented by superclasses.
*
* @param instance
* the instance to analyze for interfaces
* @return all interfaces that the given instance implements as array
*/
public static Class<?>[] getAllInterfaces(Object instance) {
Assert.notNull(instance, "Instance must not be null");
return getAllInterfacesForClass(instance.getClass());
}
/**
* Return all interfaces that the given class implements as array, including
* ones implemented by superclasses.
* <p>
* If the class itself is an interface, it gets returned as sole interface.
*
* @param clazz
* the class to analyze for interfaces
* @return all interfaces that the given object implements as array
*/
public static Class<?>[] getAllInterfacesForClass(Class<?> clazz) {
return getAllInterfacesForClass(clazz, null);
}
/**
* Return all interfaces that the given class implements as array, including
* ones implemented by superclasses.
* <p>
* If the class itself is an interface, it gets returned as sole interface.
*
* @param clazz
* the class to analyze for interfaces
* @param classLoader
* the ClassLoader that the interfaces need to be visible in (may
* be {@code null} when accepting all declared interfaces)
* @return all interfaces that the given object implements as array
*/
public static Class<?>[] getAllInterfacesForClass(Class<?> clazz, ClassLoader classLoader) {
Set<Class<?>> ifcs = getAllInterfacesForClassAsSet(clazz, classLoader);
return ifcs.toArray(new Class<?>[ifcs.size()]);
}
/**
* Return all interfaces that the given instance implements as Set,
* including ones implemented by superclasses.
*
* @param instance
* the instance to analyze for interfaces
* @return all interfaces that the given instance implements as Set
*/
public static Set<Class<?>> getAllInterfacesAsSet(Object instance) {
Assert.notNull(instance, "Instance must not be null");
return getAllInterfacesForClassAsSet(instance.getClass());
}
/**
* Return all interfaces that the given class implements as Set, including
* ones implemented by superclasses.
* <p>
* If the class itself is an interface, it gets returned as sole interface.
*
* @param clazz
* the class to analyze for interfaces
* @return all interfaces that the given object implements as Set
*/
public static Set<Class<?>> getAllInterfacesForClassAsSet(Class<?> clazz) {
return getAllInterfacesForClassAsSet(clazz, null);
}
/**
* Return all interfaces that the given class implements as Set, including
* ones implemented by superclasses.
* <p>
* If the class itself is an interface, it gets returned as sole interface.
*
* @param clazz
* the class to analyze for interfaces
* @param classLoader
* the ClassLoader that the interfaces need to be visible in (may
* be {@code null} when accepting all declared interfaces)
* @return all interfaces that the given object implements as Set
*/
public static Set<Class<?>> getAllInterfacesForClassAsSet(Class<?> clazz, ClassLoader classLoader) {
Assert.notNull(clazz, "Class must not be null");
if (clazz.isInterface() && isVisible(clazz, classLoader)) {
return Collections.<Class<?>> singleton(clazz);
}
Set<Class<?>> interfaces = new LinkedHashSet<Class<?>>();
while (clazz != null) {
Class<?>[] ifcs = clazz.getInterfaces();
for (Class<?> ifc : ifcs) {
interfaces.addAll(getAllInterfacesForClassAsSet(ifc, classLoader));
}
clazz = clazz.getSuperclass();
}
return interfaces;
}
/**
* Create a composite interface Class for the given interfaces, implementing
* the given interfaces in one single Class.
* <p>
* This implementation builds a JDK proxy class for the given interfaces.
*
* @param interfaces
* the interfaces to merge
* @param classLoader
* the ClassLoader to create the composite Class in
* @return the merged interface as Class
* @see java.lang.reflect.Proxy#getProxyClass
*/
public static Class<?> createCompositeInterface(Class<?>[] interfaces, ClassLoader classLoader) {
Assert.notEmpty(interfaces, "Interfaces must not be empty");
Assert.notNull(classLoader, "ClassLoader must not be null");
return Proxy.getProxyClass(classLoader, interfaces);
}
/**
* Determine the common ancestor of the given classes, if any.
*
* @param clazz1
* the class to introspect
* @param clazz2
* the other class to introspect
* @return the common ancestor (i.e. common superclass, one interface
* extending the other), or {@code null} if none found. If any of
* the given classes is {@code null}, the other class will be
* returned.
* @since 3.2.6
*/
public static Class<?> determineCommonAncestor(Class<?> clazz1, Class<?> clazz2) {
if (clazz1 == null) {
return clazz2;
}
if (clazz2 == null) {
return clazz1;
}
if (clazz1.isAssignableFrom(clazz2)) {
return clazz1;
}
if (clazz2.isAssignableFrom(clazz1)) {
return clazz2;
}
Class<?> ancestor = clazz1;
do {
ancestor = ancestor.getSuperclass();
if (ancestor == null || Object.class == ancestor) {
return null;
}
} while (!ancestor.isAssignableFrom(clazz2));
return ancestor;
}
/**
* Check whether the given class is visible in the given ClassLoader.
*
* @param clazz
* the class to check (typically an interface)
* @param classLoader
* the ClassLoader to check against (may be {@code null}, in
* which case this method will always return {@code true})
*/
public static boolean isVisible(Class<?> clazz, ClassLoader classLoader) {
if (classLoader == null) {
return true;
}
try {
Class<?> actualClass = classLoader.loadClass(clazz.getName());
return (clazz == actualClass);
// Else: different interface class found...
} catch (ClassNotFoundException ex) {
// No interface class found...
return false;
}
}
/**
* Check whether the given object is a CGLIB proxy.
*
* @param object
* the object to check
* @see org.springframework.aop.support.AopUtils#isCglibProxy(Object)
*/
public static boolean isCglibProxy(Object object) {
return ClassUtils.isCglibProxyClass(object.getClass());
}
/**
* Check whether the specified class is a CGLIB-generated class.
*
* @param clazz
* the class to check
*/
public static boolean isCglibProxyClass(Class<?> clazz) {
return (clazz != null && isCglibProxyClassName(clazz.getName()));
}
/**
* Check whether the specified class name is a CGLIB-generated class.
*
* @param className
* the class name to check
*/
public static boolean isCglibProxyClassName(String className) {
return (className != null && className.contains(CGLIB_CLASS_SEPARATOR));
}
}